WO2017193597A1 - 曲线绘制方法和系统 - Google Patents

曲线绘制方法和系统 Download PDF

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Publication number
WO2017193597A1
WO2017193597A1 PCT/CN2016/113215 CN2016113215W WO2017193597A1 WO 2017193597 A1 WO2017193597 A1 WO 2017193597A1 CN 2016113215 W CN2016113215 W CN 2016113215W WO 2017193597 A1 WO2017193597 A1 WO 2017193597A1
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point
coordinates
curve
starting
reference points
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PCT/CN2016/113215
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English (en)
French (fr)
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薄景仁
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广州视睿电子科技有限公司
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Publication of WO2017193597A1 publication Critical patent/WO2017193597A1/zh

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T11/00—2D [Two Dimensional] image generation
    • G06T11/20—Drawing from basic elements, e.g. lines or circles
    • G06T11/203—Drawing of straight lines or curves
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T11/00—2D [Two Dimensional] image generation
    • G06T11/20—Drawing from basic elements, e.g. lines or circles
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T11/00—2D [Two Dimensional] image generation
    • G06T11/80—Creating or modifying a manually drawn or painted image using a manual input device, e.g. mouse, light pen, direction keys on keyboard

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  • the present invention relates to the field of image rendering technology, and in particular, to a curve drawing method and system.
  • the traditional curve drawing method is to record the click coordinates after receiving the message of the mouse click, and then obtain the coordinates of the mouse movement process, and draw a straight line between the two points before and after receiving the second coordinate.
  • the lines are drawn using the coordinates of the second and third points, and the line segments in different directions of the small segments are combined into a curve. Since the transition of the drawn curve is too obvious, when there is obvious sawtooth when viewed as a long curve, the traditional curve drawing method has the disadvantage that the curve smoothness of the drawing is low.
  • a method of drawing a curve comprising the following steps:
  • the Bezier curve is drawn according to the coordinates of the starting point, the coordinates of the starting control point, the coordinates of the termination control point, and the coordinates of the termination point, and the curve segment drawn this time is obtained.
  • a curve drawing system comprising:
  • a point obtaining module is configured to acquire coordinates of the first drawing point and the second drawing point continuously input by the user;
  • a reference point obtaining module configured to select two reference points on a line connecting the first drawing point and the second drawing point, and acquire coordinates of the two reference points
  • a starting coordinate obtaining module configured to find an end point coordinate of a curve segment drawn last time as a coordinate of a starting point, and use a coordinate of the first drawing point as a coordinate of a starting control point;
  • An endpoint coordinate acquisition module is configured to extract coordinates of the coordinates of the two reference points that are close to the first drawing point as coordinates of the termination control point, and extract coordinates of another reference point as coordinates of the termination point;
  • a curve drawing module configured to perform a Bezier curve drawing according to coordinates of the starting point, coordinates of the starting control point, coordinates of the termination control point, and coordinates of the termination point, to obtain a curve drawn this time segment.
  • the above curve drawing method and system obtain the coordinates of the first drawing point and the second drawing point continuously input by the user; select two reference points on the line connecting the first drawing point and the second drawing point, and obtain two references The coordinates of the point. Find the coordinates of the end point of the curve segment drawn last time as the coordinates of the starting point, and use the coordinates of the first drawing point as the coordinates of the starting control point; extract the coordinates of the coordinates of the two reference points close to the first drawing point as the final control The coordinates of the point, the coordinates of another reference point are extracted as the coordinates of the endpoint.
  • the Bezier curve is drawn according to the coordinates of the starting point, the coordinates of the starting control point, the coordinates of the ending control point, and the coordinates of the endpoint, and the curve segment drawn this time is obtained.
  • Use Bezier curves to join coordinate points draw only a part at a time when drawing the curve, and the part between the end point and the drawing point is completed at the next curve drawing. Since the curve of the next segment adjusts the angle of the curve through the previous drawing point, the connection of the multiple curves is smooth and non-aliased, which improves the smoothness of the curve.
  • FIG. 1 is a flow chart of a method of drawing a curve in an embodiment
  • FIG. 3 is a structural diagram of a curve drawing system in an embodiment
  • FIG. 4 is a structural diagram of a curve drawing system in another embodiment.
  • a curve drawing method as shown in FIG. 1, includes the following steps:
  • Step S110 Acquire coordinates of the first drawing point and the second drawing point continuously input by the user.
  • the drawing point input by the user is received, and the coordinates of the first drawing point and the second drawing of the continuous input are obtained.
  • the first drawing point and the second drawing point are two drawing points that are continuously input by the user. It can be understood that, when the curve is drawn, as the user continuously inputs the drawing point, the first drawing point and the second drawing point specifically refer to the point. It will also change. That is to say, the first drawing point and the second drawing point are only used to distinguish different points, and the specific position is not limited. For example, when the curve was last drawn, the first drawing point is the second drawing point when it was last drawn.
  • the user can input the drawing point by clicking or dragging the mouse, or inputting the drawing point by clicking or sliding the touch screen through a stylus, a finger, etc., that is, the manner in which the user inputs the drawing point is not unique.
  • the coordinates of the first drawing point and the second drawing point are the position coordinates of the user click, or the coordinates of the start point and the end point of the motion track generated by the user operation, for example, when the curve segment is drawn for the first time, the mouse is The clicked position is used as the first drawing point, and then the coordinates of the click after the end of the mouse movement are acquired as the coordinates of the second drawing point.
  • the start point and the end point of the motion track generated on the screen when the user drags the mouse can be directly used as the first drawing point and the second drawing point, respectively.
  • Step S120 Select two reference points on the line connecting the first drawing point and the second drawing point, and acquire coordinates of the two reference points. After determining the coordinates of the first drawing point and the second drawing point, the two can be virtually connected, and two points on the connecting line are selected as reference points and coordinate extraction is performed.
  • Step S120 in this embodiment specifically includes: obtaining a three-division point of the distance between the first drawing point and the second drawing point as a reference point, and obtaining two references.
  • the coordinates of the point The distance between the first drawing point and the second drawing point is equally divided into three, and the middle two coordinates are obtained as the coordinates of the two reference points, which is convenient for coordinate calculation and extraction, and only draws 2/ in the subsequent curve drawing.
  • the curve of 3 the remaining 1/3 of the distance is used to adjust the curve angle of the next curve, so that the connection of each curve segment is smooth and excessive.
  • Step S150 Find the coordinates of the end point of the curve segment drawn last time as the coordinates of the starting point, and use the coordinates of the first drawing point as the coordinates of the starting control point.
  • the curve segment drawn last time refers to the previous curve segment in the same curve drawing, and the mouse can be stopped. Click or move as the draw stop command, and the user continuously clicks the mouse or moves the mouse between the two stop commands to draw the same curve.
  • the coordinates of the end point of the curve segment refer to the coordinates of the drawing end point of the curve segment after the completion of the drawing of one curve segment.
  • Step S160 Extract the coordinates of the coordinates of the two reference points close to the first drawing point as the coordinates of the ending control point, and extract the coordinates of the other reference point as the coordinates of the ending point. After obtaining the coordinates of the reference point between the two drawing points, the coordinates of the next drawing point are taken as the coordinates of the ending control point, and the coordinates of the next drawing point are used as the coordinates of the ending point, which is used for subsequent curve drawing.
  • Step S170 Perform a Bezier curve drawing according to the coordinates of the starting point, the coordinates of the starting control point, the coordinates of the ending control point, and the coordinates of the ending point, to obtain the curve segment drawn this time.
  • the coordinates of the starting point determined by the previous steps
  • the Bezier curve is drawn, and the curve segment drawing can be completed.
  • the starting point and the ending point are respectively the drawing start point and the drawing end point of the curve segment
  • the start control point and the ending control point are control nodes when the curve segment is drawn, which are used to provide direction information, and draw the curve segment from the start point to the end point.
  • the curve shape path is pinched during the process.
  • Bezier curve drawing is a smooth curve drawn according to the coordinates of any point at four positions.
  • the curve is drawn using the Bezier curve formula to eliminate aliasing.
  • the curve starts from the starting point to the starting control point and comes from the direction of the ending control point to the end point. Generally, it does not pass through the starting control point and the ending control point. These two points are used to provide direction information, starting point and starting point.
  • the spacing between the starting control points determines how long the curve is in the direction of the ending control point before moving to the end point.
  • the curve segment is drawn by using the cubic Bezier curve principle to avoid the sawtooth of the curve, improve the smoothness of the curve, and the operation is simple and reliable.
  • the curve drawing method further includes step S130.
  • Step S130 determining whether there is a curve segment drawn last time; if yes, proceeding to step S150.
  • step S150 Performing a search before step S150 to detect whether there is a curve segment drawn last time, and if so, It is indicated that the current curve drawing is not the first drawing.
  • step S150 the coordinates of the end point of the curve segment drawn last time are used as the coordinates of the starting point to draw the current curve to ensure the continuity of the curve.
  • the curve drawing method may further include step S140.
  • Step S140 The coordinates of the first drawing point are taken as the coordinates of the starting point and the starting control point. If there is no curve segment drawn last time, it means that the current curve is drawn as the first curve, and the coordinates of the first drawing point are directly used as the coordinates of the starting point and the starting control point, and then step S160 is performed.
  • the curve is drawn using the cubic Bezier formula.
  • the cubic Bezier curve is determined by 4 points, the starting point P0, the starting control point P1, the ending control point P2, and the ending point P3.
  • the click coordinates (X0, Y0) are recorded, and the starting point P0 and the starting control point P1 are set as the click coordinates (X0, Y0). Then get the coordinates of the mouse movement process and receive the second coordinate (X3, Y3).
  • the distance between the two mouse coordinates (X0, Y0) and the coordinates (X3, Y3) is equally divided into three coordinates (X1, Y1), (X2, Y2).
  • the starting point P0 is reset to the coordinates (X2, Y2) of the previous end point P3, and the starting control point P1 is reset to the previous mouse movement coordinate (X3, Y3).
  • the distance between the two mouse coordinates (X3, Y3) and the coordinates (X6, Y6) is divided into three equal parts to obtain the two coordinates (X4, Y4) and (X5, Y5) in the middle.
  • the above curve drawing method uses a Bezier curve to connect the coordinate points, and only draws a part at a time when the curve is drawn, and the portion between the end point and the drawing point is completed at the time of the next curve drawing. Since the curve of the next segment adjusts the angle of the curve through the previous drawing point, the connection of the multiple curves is smooth and non-aliased, which improves the smoothness of the curve.
  • the present invention also provides a curve drawing system, as shown in FIG. 3, including a drawing point obtaining module 110, The reference point acquisition module 120, the start coordinate acquisition module 150, the end point coordinate acquisition module 160, and the curve drawing module 170.
  • the drawing point obtaining module 110 is configured to acquire coordinates of the first drawing point and the second drawing point continuously input by the user.
  • the drawing point input by the user is received, and the coordinates of the first drawing point and the second drawing of the continuous input are obtained.
  • the first drawing point and the second drawing point are two drawing points that are continuously input by the user. It can be understood that, when the curve is drawn, as the user continuously inputs the drawing point, the first drawing point and the second drawing point specifically refer to the point. It will also change. That is to say, the first drawing point and the second drawing point are only used to distinguish different points, and the specific position is not limited. For example, when the curve was last drawn, the first drawing point is the second drawing point when it was last drawn.
  • the user can input the drawing point by clicking or dragging the mouse, or inputting the drawing point by clicking or sliding the touch screen through a stylus, a finger, etc., that is, the manner in which the user inputs the drawing point is not unique.
  • the coordinates of the first drawing point and the second drawing point are the position coordinates of the user click, or the coordinates of the start point and the end point of the motion track generated by the user operation, for example, when the curve segment is drawn for the first time, the mouse is The clicked position is used as the first drawing point, and then the coordinates of the click after the end of the mouse movement are acquired as the coordinates of the second drawing point.
  • the start point and the end point of the motion track generated on the screen when the user drags the mouse can be directly used as the first drawing point and the second drawing point, respectively.
  • the reference point obtaining module 120 is configured to select two reference points on a line connecting the first drawing point and the second drawing point, and acquire coordinates of the two reference points. After determining the coordinates of the first drawing point and the second drawing point, the two can be virtually connected, and two points on the connecting line are selected as reference points and coordinate extraction is performed.
  • the position of the reference point on the connection line can be adjusted according to the actual situation.
  • the reference point acquisition module 120 selects two reference points on the connection line between the first drawing point and the second drawing point, and acquires two reference points.
  • the coordinates include: obtaining a three-divided point of the distance between the first drawing point and the second drawing point as a reference point, and acquiring coordinates of the two reference points.
  • the distance between the first drawing point and the second drawing point is equally divided into three, and the middle two coordinates are obtained as the coordinates of the two reference points, which is convenient for coordinate calculation and extraction, and only draws 2/ in the subsequent curve drawing.
  • the curve of 3, the remaining 1/3 of the distance is used to adjust the curve angle of the next curve, so that the connection of each curve segment is smooth and excessive.
  • the start coordinate acquisition module 150 is configured to find the coordinates of the end point of the curve segment drawn last time as the coordinates of the starting point, and use the coordinates of the first drawing point as the coordinates of the starting control point.
  • the curve segment drawn last time refers to the previous curve segment in the same curve drawing.
  • the mouse can be stopped or clicked as the drawing stop command, and the user continuously clicks the mouse or moves the mouse as the same between the two stop command.
  • the secondary curve is drawn.
  • the coordinates of the end point of the curve segment refer to the coordinates of the drawing end point of the curve segment after the completion of the drawing of one curve segment.
  • the curve segment obtained when the previous curve is drawn is found, and the curve segment is obtained.
  • the coordinates of the end point are used as the coordinates of the starting point
  • the coordinates of the first drawing point are used as the coordinates of the starting control point, which is used for subsequent curve drawing.
  • the end point coordinate obtaining module 160 is configured to extract the coordinates of the coordinates of the two reference points close to the first drawing point as the coordinates of the ending control point, and extract the coordinates of the other reference point as the coordinates of the ending point. After obtaining the coordinates of the reference point between the two drawing points, the coordinates of the next drawing point are taken as the coordinates of the ending control point, and the coordinates of the next drawing point are used as the coordinates of the ending point, which is used for subsequent curve drawing.
  • the curve drawing module 170 is configured to perform a Bezier curve drawing according to the coordinates of the starting point, the coordinates of the starting control point, the coordinates of the ending control point, and the coordinates of the ending point, to obtain the curve segment drawn this time.
  • the Bezier curve is drawn, and the curve segment drawing can be completed.
  • the starting point and the ending point are respectively the drawing start point and the drawing end point of the curve segment, and the start control point and the ending control point are control nodes when the curve segment is drawn, which are used to provide direction information, and draw the curve segment from the start point to the end point.
  • the curve shape path is pinched during the process.
  • the curve segment is drawn by using the cubic Bezier curve principle to avoid the sawtooth of the curve, improve the smoothness of the curve, and the operation is simple and reliable.
  • the curve rendering system can also include a curved segment lookup module 130.
  • the curve segment searching module 130 is configured to: after the reference point obtaining module 120 selects two reference points on the connection line between the first drawing point and the second drawing point, and acquire coordinates of the two reference points, the starting coordinate acquiring module 150 Find the coordinates of the end point of the curve segment drawn last time as the coordinates of the starting point, and determine the curve segment of the last drawing before the coordinates of the first drawing point as the coordinates of the starting control point; if yes, control the starting coordinates The obtaining module 150 finds the coordinates of the end point of the curve segment drawn last time as the coordinates of the starting point, and uses the coordinates of the first drawing point as the coordinates of the starting control point.
  • control start coordinate acquisition module 150 searches for the coordinates of the end point of the curve segment drawn last time as the coordinates of the starting point to perform the current curve drawing, and ensures the continuity of the curve.
  • the curve rendering system can also include a starting coordinate determination module 140.
  • the starting coordinate determining module 140 is configured to use the coordinates of the first drawing point as the starting point and the coordinates of the starting control point when there is no curve segment drawn last time, and control the end point coordinate acquiring module 160 to extract the two reference points.
  • the coordinates in the coordinates near the first drawing point are taken as the coordinates of the ending control point, and the coordinates of the other reference point are extracted as the coordinates of the ending point. If there is no curve segment drawn last time, it means that the current curve is drawn as the first curve, and the coordinates of the first drawing point are directly used as the starting point and the coordinates of the starting control point, and then the curve is continued.
  • the above curve drawing system uses Bezier curves to connect coordinate points, and only draws a part at a time when drawing the curve, and the part between the end point and the drawing point is completed at the next curve drawing. Since the curve of the next segment adjusts the angle of the curve through the previous drawing point, the connection of the multiple curves is smooth and non-aliased, which improves the smoothness of the curve.

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  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
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Abstract

一种曲线绘制方法和系统，获取用户连续输入的第一绘制点和第二绘制点的坐标（S110）；选取第一绘制点和第二绘制点之间连线上的两个参考点，并获取两个参考点的坐标（S120）；查找上一次绘制的曲线段的终点坐标作为起始点的坐标，并将第一绘制点的坐标作为起始控制点的坐标（S150）；提取两个参考点的坐标中靠近第一绘制点的坐标作为终结控制点的坐标，提取另一参考点的坐标作为终结点的坐标（S160）；根据起始点的坐标、起始控制点的坐标、终结控制点的坐标和终结点的坐标进行贝塞尔曲线绘制，得到本次绘制的曲线段（S170）。终结点与绘制点之间的部分在下一次曲线绘制时完成，下一段曲线通过上一个绘制点调整曲线的角度，使得多条曲线的连接处光滑无锯齿，提高了曲线的平滑度。

Description

曲线绘制方法和系统 技术领域
本发明涉及图像绘制技术领域，特别是涉及一种曲线绘制方法和系统。
背景技术
在图像和视频处理的软件中通常都会带有绘制功能，用户可以根据自己的需求移动鼠标进行点的绘制，计算机根据各点进行图像绘制。
传统的曲线绘制方法是收到鼠标点击的消息后，记录下来点击坐标，然后获取到鼠标移动过程的坐标，收到第二个坐标的时候在前后两个点间画出直线。当收到第三个点的坐标使用第二个和第三个点的坐标画直线，由各小段不同方向的线段组合成曲线。由于画出的曲线衔接处转折太明显，当作为一条长曲线看时有明显的锯齿，传统的曲线绘制方法存在绘制的曲线平滑度低的缺点。
发明内容
基于此，有必要针对上述问题，提供一种曲线平滑度高的曲线绘制方法和系统。
一种曲线绘制方法，包括以下步骤：
获取用户连续输入的第一绘制点和第二绘制点的坐标；
选取所述第一绘制点和所述第二绘制点之间连线上的两个参考点，并获取所述两个参考点的坐标；
查找上一次绘制的曲线段的终点坐标作为起始点的坐标，并将所述第一绘制点的坐标作为起始控制点的坐标；
提取所述两个参考点的坐标中靠近所述第一绘制点的坐标作为终结控制点的坐标，提取另一参考点的坐标作为终结点的坐标；
根据所述起始点的坐标、所述起始控制点的坐标、所述终结控制点的坐标和所述终结点的坐标进行贝塞尔曲线绘制，得到本次绘制的曲线段。
一种曲线绘制系统，包括：
绘制点获取模块，用于获取用户连续输入的第一绘制点和第二绘制点的坐标；
参考点获取模块，用于选取所述第一绘制点和所述第二绘制点之间连线上的两个参考点，并获取所述两个参考点的坐标；
起始坐标获取模块，用于查找上一次绘制的曲线段的终点坐标作为起始点的坐标，并将所述第一绘制点的坐标作为起始控制点的坐标；
终点坐标获取模块，用于提取所述两个参考点的坐标中靠近所述第一绘制点的坐标作为终结控制点的坐标，提取另一参考点的坐标作为终结点的坐标；
曲线绘制模块，用于根据所述起始点的坐标、所述起始控制点的坐标、所述终结控制点的坐标和所述终结点的坐标进行贝塞尔曲线绘制，得到本次绘制的曲线段。
上述曲线绘制方法和系统，获取用户连续输入的第一绘制点和第二绘制点的坐标；选取第一绘制点和第二绘制点之间连线上的两个参考点，并获取两个参考点的坐标。查找上一次绘制的曲线段的终点坐标作为起始点的坐标，并将第一绘制点的坐标作为起始控制点的坐标；提取两个参考点的坐标中靠近第一绘制点的坐标作为终结控制点的坐标，提取另一参考点的坐标作为终结点的坐标。根据起始点的坐标、起始控制点的坐标、终结控制点的坐标和终结点的坐标进行贝塞尔曲线绘制，得到本次绘制的曲线段。使用贝塞尔曲线来连接坐标点，在进行曲线绘制时每次只绘制一部分，终结点与绘制点之间的部分在下一次曲线绘制时完成。由于下一段曲线通过上一个绘制点调整曲线的角度，使得多条曲线的连接处光滑无锯齿，提高了曲线的平滑度。
附图说明
图1为一实施例中曲线绘制方法的流程图；
图2为另一实施例中曲线绘制方法的流程图；
图3为一实施例中曲线绘制系统的结构图；
图4为另一实施例中曲线绘制系统的结构图。
具体实施方式
一种曲线绘制方法，如图1所示，包括以下步骤：
步骤S110：获取用户连续输入的第一绘制点和第二绘制点的坐标。接收用户输入的绘制点，并获取连续输入的第一绘制点和第二绘制的坐标。第一绘制点和第二绘制点是用户连续输入的两个绘制点，可以理解，在进行曲线绘制时，随着用户不断输入绘制点，第一绘制点和第二绘制点具体所指的点也会随之发生变化。也就是说第一绘制点和第二绘制点仅用于区分不同的点，并没有限定具体位置。例如在上一次绘制曲线时，则第一绘制点是上一次绘制时的第二绘制点。
用户具体可通过点击或拖动鼠标来输入绘制点，也可以是通过触控笔、手指等点击或滑动触控屏来进行绘制点的输入，即用户输入绘制点的方式并不唯一。本实施例中第一绘制点和第二绘制点的坐标为用户点击的位置坐标，或用户操作所产生的运动轨迹的起点和终点的坐标，例如，当第一次绘制曲线段时，将鼠标点击的位置作为第一绘制点，然后获取到鼠标移动结束后点击的坐标，作为第二绘制点的坐标。而在后续的曲线段绘制过程中，可直接将用户拖动鼠标时在屏幕产生的运动轨迹的起点和终点分别作为第一绘制点和第二绘制点。
步骤S120：选取第一绘制点和第二绘制点之间连线上的两个参考点，并获取两个参考点的坐标。在确定第一绘制点和第二绘制点的坐标后，可对两者进行虚拟连线，选取连线上的两个点作为参考点并进行坐标提取。
参考点在连线上的位置可根据实际情况调节，本实施例中步骤S120具体包括：获取第一绘制点和第二绘制点之间距离的三等分点作为参考点，并获取两个参考点的坐标。对第一绘制点和第二绘制点之间的距离三等分，得到中间的两个坐标作为两个参考点的坐标，便于坐标计算和提取，且在后续的曲线绘制时只画出2/3的曲线，剩余1/3的距离用作对下一段曲线进行曲线角度的调整，使得各曲线段的连接处光滑过度。
步骤S150：查找上一次绘制的曲线段的终点坐标作为起始点的坐标，并将第一绘制点的坐标作为起始控制点的坐标。
上一次绘制的曲线段是指在同一次曲线绘制中的上一曲线段，可将鼠标停 止点击或移动作为绘制停止指令，两次绘制停止指令之间用户连续点击鼠标或移动鼠标的动作作为同一次曲线绘制。曲线段的终点坐标即指在一次曲线段绘制完成后，该曲线段的绘制终点的坐标。以同一次曲线绘制中的第一个曲线段为基础，每次确定两个连续的绘制点以及绘制点之间的参考点之后，找到上一次曲线绘制时得到的曲线段，并获取曲线段的终点坐标作为起始点的坐标，并将第一绘制点的坐标作为起始控制点的坐标，用作后续进行曲线绘制。
步骤S160：提取两个参考点的坐标中靠近第一绘制点的坐标作为终结控制点的坐标，提取另一参考点的坐标作为终结点的坐标。在得到两个绘制点之间的参考点的坐标之后，将靠近前一绘制点的坐标作为终结控制点的坐标，靠近后一绘制点的坐标作为终结点的坐标，用作后续进行曲线绘制。
步骤S170：根据起始点的坐标、起始控制点的坐标、终结控制点的坐标和终结点的坐标进行贝塞尔曲线绘制，得到本次绘制的曲线段。根据前面步骤确定的起始点的坐标、起始控制点的坐标、终结控制点的坐标和终结点的坐标进行贝塞尔曲线绘制，即可完成本次的曲线段绘制。起始点和终结点分别为曲线段的绘制起点和绘制终点，起始控制点和终结控制点为绘制曲线段时的控制节点，用于提供方向资讯，在由起始点到终结点绘制曲线段的过程中牵制曲线形状路径。
贝塞尔曲线绘制是依据四个位置任意的点坐标绘制出的一条光滑曲线，使用贝塞尔曲线公式画曲线来消除锯齿。曲线起于起始点走向起始控制点，并从终结控制点的方向来到终结点，一般不会经过起始控制点和终结控制点，这两个点用作提供方向资讯，起始点与起始控制点之间的间距决定了曲线在转而趋进终结点之前，走向终结控制点方向的“长度有多长”。利用三次贝塞尔曲线原理进行曲线段的绘制，避免曲线出现锯齿，提高曲线平滑度，操作简便且可靠性高。
在其中一个实施例中，如图2所示，步骤S120之后，步骤S150之前，曲线绘制方法还包括步骤S130。
步骤S130：判断是否存在上一次绘制的曲线段；若是，则进行步骤S150。
在步骤S150之前进行查找，检测是否存在上一次绘制的曲线段，若是，则 说明本次曲线绘制不是第一次绘制，进行步骤S150，将上一次绘制的曲线段的终点坐标作为起始点的坐标进行本次曲线绘制，确保曲线的连续性。
进一步地，继续参照图2，若不存在上一次绘制的曲线段，曲线绘制方法还可包括步骤S140。
步骤S140：将第一绘制点的坐标作为起始点和起始控制点的坐标。若不存在上一次绘制的曲线段，则说明本次绘制为第一次曲线绘制，直接将第一绘制点的坐标作为起始点和起始控制点的坐标后进行步骤S160。
以下结合具体的实施例对上述曲线绘制方法进行进一步地解释说明。
使用三次贝塞尔公式画出曲线，三次贝塞尔曲线由4个点决定，起始点P0，起始控制点P1、终结控制点P2、终结点P3。
在收到鼠标点击的消息后，记录下点击坐标(X0，Y0)，将起始点P0、起始控制点P1设为点击坐标(X0，Y0)。然后获取到鼠标移动过程的坐标，收到第二个坐标(X3，Y3)。将前后两个鼠标坐标(X0，Y0)和坐标(X3，Y3)之间的距离三等分，得到中间的两个坐标(X1，Y1)，(X2，Y2)。将终结控制点P2设为(X1，Y1)，将终结点P3设为(X2，Y2)，画出贝塞尔曲线。
继续获取鼠标移动过程的坐标，收到第三个坐标(X6，Y6)。将起始点P0重新设为之前的终结点P3的坐标(X2，Y2)，将起始控制点P1重新设为之前的鼠标移动坐标(X3，Y3)。将前后两个鼠标坐标(X3，Y3)和坐标(X6，Y6)之间的距离三等分，得到中间的两个坐标(X4，Y4)、(X5，Y5)。将终结控制点P2重新设为(X4，Y4)，将终结点P3重新设为(X5，Y5)，画出贝塞尔曲线。如此，当用户持续控制鼠标移动，重复上述步骤便可持续进行各个曲线段的绘制。
上述曲线绘制方法，使用贝塞尔曲线来连接坐标点，在进行曲线绘制时每次只绘制一部分，终结点与绘制点之间的部分在下一次曲线绘制时完成。由于下一段曲线通过上一个绘制点调整曲线的角度，使得多条曲线的连接处光滑无锯齿，提高了曲线的平滑度。
本发明还提供了一种曲线绘制系统，如图3所示，包括绘制点获取模块110、 参考点获取模块120、起始坐标获取模块150、终点坐标获取模块160和曲线绘制模块170。
绘制点获取模块110用于获取用户连续输入的第一绘制点和第二绘制点的坐标。接收用户输入的绘制点，并获取连续输入的第一绘制点和第二绘制的坐标。第一绘制点和第二绘制点是用户连续输入的两个绘制点，可以理解，在进行曲线绘制时，随着用户不断输入绘制点，第一绘制点和第二绘制点具体所指的点也会随之发生变化。也就是说第一绘制点和第二绘制点仅用于区分不同的点，并没有限定具体位置。例如在上一次绘制曲线时，则第一绘制点是上一次绘制时的第二绘制点。
用户具体可通过点击或拖动鼠标来输入绘制点，也可以是通过触控笔、手指等点击或滑动触控屏来进行绘制点的输入，即用户输入绘制点的方式并不唯一。本实施例中第一绘制点和第二绘制点的坐标为用户点击的位置坐标，或用户操作所产生的运动轨迹的起点和终点的坐标，例如，当第一次绘制曲线段时，将鼠标点击的位置作为第一绘制点，然后获取到鼠标移动结束后点击的坐标，作为第二绘制点的坐标。而在后续的曲线段绘制过程中，可直接将用户拖动鼠标时在屏幕产生的运动轨迹的起点和终点分别作为第一绘制点和第二绘制点。
参考点获取模块120用于选取第一绘制点和第二绘制点之间连线上的两个参考点，并获取两个参考点的坐标。在确定第一绘制点和第二绘制点的坐标后，可对两者进行虚拟连线，选取连线上的两个点作为参考点并进行坐标提取。
参考点在连线上的位置可根据实际情况调节，本实施例中参考点获取模块120选取第一绘制点和第二绘制点之间连线上的两个参考点，并获取两个参考点的坐标包括：获取第一绘制点和第二绘制点之间距离的三等分点作为参考点，并获取两个参考点的坐标。对第一绘制点和第二绘制点之间的距离三等分，得到中间的两个坐标作为两个参考点的坐标，便于坐标计算和提取，且在后续的曲线绘制时只画出2/3的曲线，剩余1/3的距离用作对下一段曲线进行曲线角度的调整，使得各曲线段的连接处光滑过度。
起始坐标获取模块150用于查找上一次绘制的曲线段的终点坐标作为起始点的坐标，并将第一绘制点的坐标作为起始控制点的坐标。
上一次绘制的曲线段是指在同一次曲线绘制中的上一曲线段，可将鼠标停止点击或移动作为绘制停止指令，两次绘制停止指令之间用户连续点击鼠标或移动鼠标的动作作为同一次曲线绘制。曲线段的终点坐标即指在一次曲线段绘制完成后，该曲线段的绘制终点的坐标。以同一次曲线绘制中的第一个曲线段为基础，每次确定两个连续的绘制点以及绘制点之间的参考点之后，找到上一次曲线绘制时得到的曲线段，并获取曲线段的终点坐标作为起始点的坐标，并将第一绘制点的坐标作为起始控制点的坐标，用作后续进行曲线绘制。
终点坐标获取模块160用于提取两个参考点的坐标中靠近第一绘制点的坐标作为终结控制点的坐标，提取另一参考点的坐标作为终结点的坐标。在得到两个绘制点之间的参考点的坐标之后，将靠近前一绘制点的坐标作为终结控制点的坐标，靠近后一绘制点的坐标作为终结点的坐标，用作后续进行曲线绘制。
曲线绘制模块170用于根据起始点的坐标、起始控制点的坐标、终结控制点的坐标和终结点的坐标进行贝塞尔曲线绘制，得到本次绘制的曲线段。根据前面确定的起始点的坐标、起始控制点的坐标、终结控制点的坐标和终结点的坐标进行贝塞尔曲线绘制，即可完成本次的曲线段绘制。起始点和终结点分别为曲线段的绘制起点和绘制终点，起始控制点和终结控制点为绘制曲线段时的控制节点，用于提供方向资讯，在由起始点到终结点绘制曲线段的过程中牵制曲线形状路径。利用三次贝塞尔曲线原理进行曲线段的绘制，避免曲线出现锯齿，提高曲线平滑度，操作简便且可靠性高。
在其中一个实施例中，如图4所示，曲线绘制系统还可包括曲线段查找模块130。
曲线段查找模块130用于在参考点获取模块120选取第一绘制点和第二绘制点之间连线上的两个参考点，并获取两个参考点的坐标之后，起始坐标获取模块150查找上一次绘制的曲线段的终点坐标作为起始点的坐标，并将第一绘制点的坐标作为起始控制点的坐标之前，判断是否存在上一次绘制的曲线段；若是，则控制起始坐标获取模块150查找上一次绘制的曲线段的终点坐标作为起始点的坐标，并将第一绘制点的坐标作为起始控制点的坐标。
检测是否存在上一次绘制的曲线段，若是，则说明本次曲线绘制不是第一 次绘制，控制起始坐标获取模块150查找上一次绘制的曲线段的终点坐标作为起始点的坐标进行本次曲线绘制，确保曲线的连续性。
进一步地，继续参照图4，曲线绘制系统还可包括起始坐标确定模块140。
起始坐标确定模块140用于在不存在上一次绘制的曲线段时，将第一绘制点的坐标作为起始点和起始控制点的坐标，并控制终点坐标获取模块160提取两个参考点的坐标中靠近第一绘制点的坐标作为终结控制点的坐标，提取另一参考点的坐标作为终结点的坐标。若不存在上一次绘制的曲线段，则说明本次绘制为第一次曲线绘制，直接将第一绘制点的坐标作为起始点和起始控制点的坐标后继续曲线绘制。
上述曲线绘制系统，使用贝塞尔曲线来连接坐标点，在进行曲线绘制时每次只绘制一部分，终结点与绘制点之间的部分在下一次曲线绘制时完成。由于下一段曲线通过上一个绘制点调整曲线的角度，使得多条曲线的连接处光滑无锯齿，提高了曲线的平滑度。
以上所述实施例的各技术特征可以进行任意的组合，为使描述简洁，未对上述实施例中的各个技术特征所有可能的组合都进行描述，然而，只要这些技术特征的组合不存在矛盾，都应当认为是本说明书记载的范围。
以上所述实施例仅表达了本发明的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对发明专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干变形和改进，这些都属于本发明的保护范围。因此，本发明专利的保护范围应以所附权利要求为准。

Claims (10)

  1. 一种曲线绘制方法，其特征在于，包括以下步骤：
    获取用户连续输入的第一绘制点和第二绘制点的坐标；
    选取所述第一绘制点和所述第二绘制点之间连线上的两个参考点，并获取所述两个参考点的坐标；
    查找上一次绘制的曲线段的终点坐标作为起始点的坐标，并将所述第一绘制点的坐标作为起始控制点的坐标；
    提取所述两个参考点的坐标中靠近所述第一绘制点的坐标作为终结控制点的坐标，提取另一参考点的坐标作为终结点的坐标；
    根据所述起始点的坐标、所述起始控制点的坐标、所述终结控制点的坐标和所述终结点的坐标进行贝塞尔曲线绘制，得到本次绘制的曲线段。
  2. 根据权利要求1所述的曲线绘制方法，其特征在于，所述选取所述第一绘制点和所述第二绘制点之间连线上的两个参考点，并获取所述两个参考点的坐标的步骤包括：获取所述第一绘制点和所述第二绘制点之间距离的三等分点作为参考点，并获取两个所述参考点的坐标。
  3. 根据权利要求1所述的曲线绘制方法，其特征在于，所述选取所述第一绘制点和所述第二绘制点之间连线上的两个参考点，并获取所述两个参考点的坐标的步骤之后，所述查找上一次绘制的曲线段的终点坐标作为起始点的坐标，并将所述第一绘制点的坐标作为起始控制点的坐标的步骤之前，还包括以下步骤：
    判断是否存在上一次绘制的曲线段；
    若是，则进行所述查找上一次绘制的曲线段的终点坐标作为起始点的坐标，并将所述第一绘制点的坐标作为起始控制点的坐标的步骤。
  4. 根据权利要求3所述的曲线绘制方法，其特征在于，若不存在上一次绘制的曲线段，还包括以下步骤：
    将所述第一绘制点的坐标作为起始点和起始控制点的坐标，并进行所述提取所述两个参考点的坐标中靠近所述第一绘制点的坐标作为终结控制点的坐标，提取另一参考点的坐标作为终结点的坐标的步骤。
  5. 根据权利要求1所述的曲线绘制方法，其特征在于，所述第一绘制点和第二绘制点的坐标为用户点击的位置坐标，或用户操作所产生的运动轨迹的起点和终点的坐标。
  6. 一种曲线绘制系统，其特征在于，包括：
    绘制点获取模块，用于获取用户连续输入的第一绘制点和第二绘制点的坐标；
    参考点获取模块，用于选取所述第一绘制点和所述第二绘制点之间连线上的两个参考点，并获取所述两个参考点的坐标；
    起始坐标获取模块，用于查找上一次绘制的曲线段的终点坐标作为起始点的坐标，并将所述第一绘制点的坐标作为起始控制点的坐标；
    终点坐标获取模块，用于提取所述两个参考点的坐标中靠近所述第一绘制点的坐标作为终结控制点的坐标，提取另一参考点的坐标作为终结点的坐标；
    曲线绘制模块，用于根据所述起始点的坐标、所述起始控制点的坐标、所述终结控制点的坐标和所述终结点的坐标进行贝塞尔曲线绘制，得到本次绘制的曲线段。
  7. 根据权利要求6所述的曲线绘制系统，其特征在于，所述参考点获取模块选取所述第一绘制点和所述第二绘制点之间连线上的两个参考点，并获取所述两个参考点的坐标包括：获取所述第一绘制点和所述第二绘制点之间距离的三等分点作为参考点，并获取所述两个参考点的坐标。
  8. 根据权利要求6所述的曲线绘制系统，其特征在于，还包括：
    曲线段查找模块，用于在所述参考点获取模块选取所述第一绘制点和所述第二绘制点之间连线上的两个参考点，并获取所述两个参考点的坐标之后，所述起始坐标获取模块查找上一次绘制的曲线段的终点坐标作为起始点的坐标，并将所述第一绘制点的坐标作为起始控制点的坐标之前，判断是否存在上一次绘制的曲线段；若是，则控制所述起始坐标获取模块查找上一次绘制的曲线段的终点坐标作为起始点的坐标，并将所述第一绘制点的坐标作为起始控制点的坐标。
  9. 根据权利要求8所述的曲线绘制系统，其特征在于，还包括：
    起始坐标确定模块，用于在不存在上一次绘制的曲线段时，将所述第一绘制点的坐标作为起始点和起始控制点的坐标，并控制所述终点坐标获取模块提取所述两个参考点的坐标中靠近所述第一绘制点的坐标作为终结控制点的坐标，提取另一参考点的坐标作为终结点的坐标。
  10. 根据权利要求6所述的曲线绘制系统，其特征在于，所述第一绘制点和第二绘制点的坐标为用户点击的位置坐标，或用户操作所产生的运动轨迹的起点和终点的坐标。
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